Events link property are not displayed

## What Happened

My meetings events have a ```URL``` property but the link are not displayed in elementary calendar app.

## Event in browser calendar

## Same Event in elementary calendar

### Example of .ics event generated in my calendar provider.
```
BEGIN:VCALENDAR
PRODID:-//Zoho Corporation//Zoho Calendar-US//EN
VERSION:2.0
X-WR-CALNAME:Test
X-WR-TIMEZONE:America/Bogota
CALSCALE:GREGORIAN
METHOD:PUBLISH
BEGIN:VEVENT
SUMMARY:Event Test
DESCRIPTION:
DTSTART:20210821T001500Z
DTEND:20210821T003000Z
LOCATION:
CLASS:PUBLIC
IMPORTANT:0
STATUS:CONFIRMED
UID:29015d59db9c4cf49d0decf29426b7df@zoho.com
TRANSP:TRANSPARENT
PRIORITY:5
CREATED:20210820T224126Z
LAST-MODIFIED:20210820T224126Z
DTSTAMP:20210820T224141Z
ORGANIZER;CN=Anderson CEO:MAILTO:a@slinqer.com
BEGIN:VALARM
ACTION:EMAIL
TRIGGER;VALUE=DURATION;RELATED=START:-PT5M
END:VALARM
URL:https://google.com
END:VEVENT
END:VCALENDAR
```

---
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